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Laboratory Studies Into Undercarriage Systems compares to the case of the 680/10.5/2.2 and the 800/10.5/2.5 from Ansorge (2005, a). Again, the higher section width tyre with similar inflation pressure as the wider tyre created similar soil displacement. Therefore the larger section height accounts for the smaller section width. The potential difference in carcass stiffness of cross ply (600/4.5/1.4) vs. radial (500-85/4.5/1.4) tyre did not have an influence. The 700/4.5/1.0 tyre was not able to utilize its large section width and low inflation pressure to create a significantly smaller soil displacement although having the largest contact area of 0.47 m 2 . Depth (mm) 0 100 200 300 400 500 600 700 Displacement (mm) 0 10 20 30 40 50 60 70 80 Figure 31: Soil displacement vs. depth for the rear tyres 500-70/4.5/2.3 500-85/4.5/1.4 600/4.5/1.4 700/4.5/1.0 The average increase in soil density caused by the implement tyres was similar to the 800/10.5/1.25 tyre, both increasing soil density by 12%; half the load on a smaller tyre increased density by a similar amount to the total load at half the recommended inflation pressure. In order to investigate the additional soil displacement caused by the rear tyres, Figure 32 contains the soil displacement caused by the front axle on its own and after the additional pass of the rear tyre. After the pass of a track, the extra soil displacement from the rear tyre can be neglected. The same held true for the 900/10.5/1.9 followed by the 700/4.5/1.0. However, if the 900/10.5/1.9 was followed by the 500-70/4.5/2.3 soil displacement increased considerably. Thus, the rear tyre size was crucial in relation to soil displacement after the pass of a soil protecting tyre, yet it was not crucial after the pass of a track as long as the load could be carried and distributed by the strong layer at the surface created by the track. The strong layer phenomenon originating from the track will be discussed in 7.1. Ph.D. Thesis Dirk Ansorge (2007) LSD 42
Laboratory Studies Into Undercarriage Systems Depth (mm) Displacement (mm) -20 0 20 40 60 80 100 120 0 100 200 300 400 500 600 700 900-700 900-500/70 Track-700 Track-500/70 Track on its own 900 on its own Figure 32: Soil displacement caused by the front implement and total soil displacement caused by the rear implement For entire undercarriage systems the two distinct groups obvious in penetrometer resis- tance were obvious in the soil displacement data in Figure 33, too. Here the wheel type undercarriage systems showed a significantly larger soil displacement i.e. increase in soil density than the track type undercarriage systems. Statistically there could be more differ- ences proven. The two tracks were statistically the same and so is the 680-680 to the 900- 700. The 23-11 is equal to the 680-700. All other combinations are significantly different from each other. The two groups are split up in Figure 34 for the wheel type soil displacement and in Figure 35 for the track type soil displacement. Depth (mm) 0 100 200 300 400 500 600 700 Displacement (mm) -20 0 20 40 60 80 100 120 140 Figure 33: Soil displacement for different undercarriage systems Ph.D. Thesis Dirk Ansorge (2007) LSD Track-500/70 Track-700 680 Alternative 680-680 680-700 Dual 680-500/85 900X3 900-700 900-500/70 23-11 LSD 43
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Cranfield University School of Appl
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Abstract Ancillary experiments show
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Table of Contents TABLE OF CONTENTS
Page 7 and 8: Table of Contents 4.1.3 Analysis of
Page 9 and 10: Table of Contents 11.1.1.1 Comparis
Page 11 and 12: List of Figures and Tables Figure 3
Page 13 and 14: List of Figures and Tables Figure 1
Page 15 and 16: Nomenclature NOMENCLATURE Abbreviat
Page 17 and 18: Introduction 1 INTRODUCTION 1.1 Bac
Page 19 and 20: Introduction � Ansorge, D. and Go
Page 21 and 22: Introduction 1.2 Aim To elucidate t
Page 23 and 24: Introduction a) the soil compaction
Page 25 and 26: Experimental Methods 2.1.1.1 Test F
Page 27 and 28: Experimental Methods had been mount
Page 29 and 30: Experimental Methods track; the loa
Page 31 and 32: Experimental Methods 800/10.5/2.5 t
Page 33 and 34: Experimental Methods term. In the m
Page 35 and 36: Experimental Methods Soil Surface F
Page 37 and 38: Experimental Methods Depth (cm) 0 1
Page 39 and 40: Experimental Methods ence surface c
Page 41 and 42: Experimental Methods chine derives
Page 43 and 44: Experimental Methods depth. The dat
Page 45 and 46: Experimental Methods with water and
Page 47 and 48: Experimental Methods 2.4 Statistica
Page 49 and 50: Laboratory Studies Into Undercarria
Page 57: Laboratory Studies Into Undercarria
Page 77 and 78: Field Study With Full Size Combine
Page 99 and 100: Alleviation of Soil Compaction Howe
Page 101 and 102: Alleviation of Soil Compaction not
Page 103 and 104: Alleviation of Soil Compaction in a
Page 105 and 106: Alleviation of Soil Compaction diff
Page 107 and 108: Soil Compaction Models sibilities t
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Soil Compaction Models depends on t
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Soil Compaction Models Wroth (1968)
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Soil Compaction Models however, the
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Soil Compaction Models level. Criti
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Soil Compaction Models Utilizing Ke
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Soil Compaction Models average of m
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Soil Compaction Models Depth (mm) -
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Soil Compaction Models ture content
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Soil Compaction Models with four ot
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Soil Compaction Models Predicted In
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Soil Compaction Models Depth (mm) -
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Soil Compaction Models and 13.7 % b
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Soil Compaction Models Rel. Density
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Soil Compaction Models VCL paramete
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Soil Compaction Models The approach
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Soil Compaction Models surface stay
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Soil Compaction Models This result
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Soil Compaction Models 6.6.1.3 Wate
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Soil Compaction Models σσ 1 (kPA)
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Soil Compaction Models pressure to
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Soil Compaction Models The response
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Soil Compaction Models On medium so
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Soil Compaction Models SOILFLEX tak
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Ancillary Experiments 7 ANCILLARY E
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Ancillary Experiments Average conta
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Ancillary Experiments In order to c
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Ancillary Experiments contrary, the
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Ancillary Experiments Figure 102: S
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Ancillary Experiments track and the
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Ancillary Experiments even when hav
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Ancillary Experiments 7.3.2 Influen
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Ancillary Experiments The results f
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Ancillary Experiments Figure 117: S
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Ancillary Experiments Contact Press
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Ancillary Experiments Figure 123: F
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Ancillary Experiments Sinkage (mm)
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Ancillary Experiments model which o
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Ancillary Experiments 7.3.5 The Inf
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Ancillary Experiments 7.3.7 Discuss
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Ancillary Experiments Terzaghi (194
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Ancillary Experiments contact area.
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Ancillary Experiments soil forward
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Conclusions � The longitudinal so
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Bibliography 10 BIBLIOGRAPHY Aboaba
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Bibliography Defossez, P., Richard,
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Bibliography Gregory, A.S.; Whalley
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Bibliography Lamande, M., Schjonnin
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Bibliography Seig, D., 1985. Soil C
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Appendix 11 APPENDIX Ph.D. Thesis D
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Appendix Figure 32: VCL sample at t
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Appendix comparison at the deepest
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Appendix Estimated Pressure (kPa) 2
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Appendix 11.1.1.2.1 SOCOMO One of t
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Appendix by Seig (1985) who showed
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Appendix Soil water content 15 % an
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Appendix Adapting critical state so
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Appendix density is obtained by add
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Appendix Table 5: Values of constan
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Appendix choice of a concentration
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Appendix 11.1.3.1 Dense/Hard and Lo
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Appendix 11.1.3.2 Stratified Soil C
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Appendix To summarize the ability t
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Appendix In the following the predi
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Appendix concentration factor of 4,
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Appendix 11.1.5.1 Confining Pressur
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Appendix Figure 24. The VCL created
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Appendix Rel. Density 2 1,9 1,8 1,7
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Appendix relation of � 1 to � 2
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Appendix Rel. Density 2 1,9 1,8 1,7
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Appendix Rel. Density 1,7 1,68 1,66
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Appendix Depth (mm) 0,0 100,0 200,0
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Appendix Figure 42: Plate in cookin
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Appendix � z � � �� k c p
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Appendix Table 8: n and k depending
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Appendix to the plate sinkage equat
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Appendix with a slight deviation fr
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Appendix Table 12: DBD values for a
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